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If you want to have a mortar joint that is going to withstand the heave, then you need to pour a slab to set the curbstone on it. Personally, I would pour a 4" concrete border and set the curbstone in the concrete. Then you can come back and point later. The only time that I use just mortar on curbstone is if I am just trying to hold it in place long enough for the paving and/or back fill to be installed behind and in front of it. Make sure to reinforce the concrete with some rebar.
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Matt
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